Since vBulletin doesn't have an official blog system I decided to use the newest b2 for an addon to our vB site. In other implementations of blogs I've done I found it a problem to have comments turned on because of crappy and spamming comments. So I had an idea that maybe there was a way to integrate it with vB.
-only vB members could post a comment
-the comment would include the blog story title and link, plus the comment
-the comment would be posted as a new thread in vB
-any more comments on that b2 article would be placed in that same vB thread